Pneumatic and other drill.



No. 868,661. PATENTED 00122, 1907.

M. HARDSOGG.

PNEUMATIC AND OTHER DRILL.

APPLIOATION FILED FEB. 20, 1906.

Wifiess s %Wm n1: nunms PETERS 00., WASHINGTON, n. c

UNITED PATENT OFFICE.

hfAlitTllN HARDSOCG, OF OlTUMWA, IOWA.

PNEUMATIC AND OTHER DRILL.

To all 'ZtitOlIt it may concern:

lle it known that l, lllARTIN Hannsooo, a citizen of the United States. residing at ()ttuinwa, in the county of Wapello and State of Iowa, have invented certain new and useful Improvements in Pneumatic and other Drills, of which the following is a specification.

The use of pneumatic and other drills is attended with the production of a line dust which is thown off by the cutting of the drill and accumulates in the bit of the drill, interfering with the cutting operation, and in addition this line dust or particles impregnate the air and are objectionable for that reason.

The object of the present invention is to construct a drill with a shank or'stem by which the dust or line particles will be removed or taken away and not inter here with the operation of the cutting, or to impregnate the air.

The invention consists in the features of construction and combinations of parts hereinafter described and claimed.

in the drawings Figure 1 is a side elevation of a drill having four cutters or bits; .Fig. 2 a sectional elevation of the drill shown in Fig. 1; Fig. 3 an end elevation of the drill shown in Fig. l; Fig. 4 a cross section of the shank or stem of the drill of Fig. l.

The drill shown has a shank or stem A iormed of two wings a, separated by V shaped cuts 1) on each side and connected by a center or web 0 between the cuts, as shown in Fig. 4. Each wing a has an exterior circular or curved face (I and two opposite flat or straight faces a, as shown in Fig. 4t. The flat faces a are of a shape to enable the a ting end of the drill to be upset and furnish cross heads for tour cutters or blades, one cutter or blade for each side flat face of the wings oi the shank or stem, as shown in Fig. 3. Each wing at of the shank or stein has extending longitudinally therethrough a hole or passage. The hole or passage f of one wing is for supplying air under pressure, or other .tluid or liquid, to the acting end of the drill, for keeping the cutters or blades cool and in operative shape. The longitudinal hole or passage 9 in the other wing receives the air under pressure from the acting end of the drill for the air to flow back and carry with it the line dust and line particles away from the cutters or blades, thereby keeping the acting end of the drill perfectly clear and free from becoming clogged and inoperative l'rom the line dust or particles, and also at the same time preventing the dust and line particles from passing out of the hole or opening being cut by the drill into the atmosphere.

It will thus be seen thatwith the drill of the present invention a supply passage ior air under pressure or othercooling medium, is furnished, and a passage for withdrawing the line dust and particles from the acting end of the drill is provided, so that in use the drill Specification of Letters Patent. Application filed February 20, 1906.

. as shown in Figs. 1 and 2; and each bit or the passage f will Patented Oct. 22, 1907. Serial No- 302,049-

at its acting end is maintained cool and cannot become clogged or interfered with by line dust or particles. The passage 9 can be connected with a hose or other The acting end of the shank or stem is upset so as to form, on each flat or straight face a, a cutter or blade outwardly tapered from the body of the shank or stem passage f for the air or other medium opens between two adjoining bits or blades, as shown in Fig. 3, so that air or other medium will be properly delivered to the cutting edges of the bits or blades, and the discharge hole or passage g, for withdrawing the air ,or other medium and the fine dust and particles commingled therewith, likewise opens between two adjoining cutters or blades, as shown in Fig 3, so that the air or other medium, under pressure, Will flow back through the hole or passage and carry with it the fine dust and line partidles for discharge at the rear end of the shank or stem.

The drill oi the present invention has a shank or stem with four cutters or blades formed integral, and in use, supply air or other medium to maintain the cutting end of the drill or tool ina cool condition and operative; and the hole or passage g will furnish an exit through Which the dust and fine particles can be Withdrawn, keeping the acting end of the tool free from dust or line particles, and preventing the escape of dust and line particles into the atmosphere.

The drill of the present invention, furnishes, by the shank or stem thereof, the means for supplying a cooling or other medium to the acting end, and a means for preventing the accumulation of dust or particles at the acting end of the drill, and by which means the withdrawing the fine dust or particles, a suction can be produced through the hole or passage 9 by which the dust and fine particles can be Withdrawn from the acting end of the drill.

What I claim as new and desire to secure by Let ters Patent is:

1. A shank for a pneumatic tool formed 01 two wings and a solid center, each wing having an exterior with a curved face and two opposite flat faces furnishing end' faces to produce four bits or blades, each with a cutting edge, and each wing having a longitudinal passage extending through its body, one passage for admitting a cooling medium to the acting end of the tool and the other passage for withdrawing dust and fine particles from around the acting end of the tool, substantially as described.

2. A shank for a pneumatic tool formed of two wings and a solid center, each wing having an exterior with a curved face and two opposite flat faces, furnishing end faces to produce tour bits or blades, each with a cutting edge. and each wing having a longitudinal passage extending through its body, each passage opening between two adjoining cutters, one passage foradmitting a cooling medium to the acting end of the tool and the other passage for Withdrawing dust and fine particles from around the acting end of the tool, substantially as described.

MARTIN I-IARDSOCG.

Witnesses.

MERRILL C. GILMORE, EDWIN G. Moon. 

